28 June 2015 to 2 July 2015
JW Marriott Starr Pass Resort
Etc/GMT-7 timezone

Influence of tailored MLI for complex surface geometries on heat transfer

29 Jun 2015, 16:15
15m
Tucson Ballroom F ()

Tucson Ballroom F

Contributed Oral Presentation CEC-14 - Thermal Insulation Systems C1OrF - Thermal Insulation Applications and Measurements

Speaker

Thomas Richter (Karlsruhe Institute of Technology (KIT))

Description

Complex, non-developable surfaces require a tailored multi-layer insulation (MLI) for lowest heat loads. The most experiments showing the heat transfer through MLI are performed under quasi-ideal conditions determining the principle insulation quality. But the surface to be insulated in real cryostats implies feed-throughs and other non-developable surface parts. The thermal performance of MLI is degraded significantly at cutting points. To investigate this degrading effect a LN2– filled cylinder with a diameter of 219 mm and a length of 1820 mm was insulated with MLI and the heat load was measured calorimetrically. In addition the heat load to an insulated cylinder with eighteen branches was measured. Both the cylinders have the same surface of 1.37 m2 for a comparison of the results. This article describes the experiments with different ways of tailoring the MLI for the cylinder with branches and discusses their results. It was shown that the cutting points at the branches have a significant degrading influence on the thermal performance of MLI.

Primary author

Dr Holger Neumann (Karlsruhe Institute of Technology (KIT))

Co-authors

Robert Mayrhofer (RUAG Space GmbH) Thomas Richter (Karlsruhe Institute of Technology (KIT))

Presentation Materials